Jimmy is a fictional character and the student of the Oklahoma High School team in the Kunio-kun series, who first appears in Bikkuri Nekketsu Shin Kiroku! (Japan version only). He shares the same sprite and moveset as the Hattori Twins (Ryūichi and Ryūji), although with a different color. He has never returned in any other Kunio-kun games until Super Dodgeball Brawlers and River City Super Sports Challenge.
- It is unknown if he actually is or is based on Jimmy Lee, one of the protagonists of the Double Dragon series (also from Technōs Japan), although since he uses the same sprite as Ryūichi and Ryūji Hattori, who are indeed inspired by Billy and Jimmy Lee, it makes it plausible that he is at least a nod to said series.
- He was absent (along with Hattori Twins, Nanase and Ichijou) in Crash 'n the Boys: Street Challenge, a localized version of Bikkuri Nekketsu Shin Kiroku!.